Piston for internal combustion
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsTetsuo Omura, Akio Yoshimatsu, Yasushi Yoshihara, Masafumi Takeda
Life of this patent
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Abstract
Disclosed is a piston (16) that is capable of not only suppressing the occurrence of knocking but also reducing cooling loss in an internal combustion engine in which a tumble flow is formed in a cylinder. The piston for the internal combustion engine in which the tumble flow is formed in the cylinder includes a non-adiabatic region (50) that is a region on a piston upper surface (35) brought into contact with the tumble flow during an intake stroke and has no insulating layer. The piston also includes an adiabatic region (52) that is a region on at least a part of the piston upper surface excluding the non-adiabatic region and has an insulating layer.
Claims2
A piston for an internal combustion engine, comprising:
- a non-adiabatic region that includes a central portion of a piston upper surface, wherein the piston upper surface has an edge which is in contact with the piston wall, the non-adiabatic region being shaped like a strip extended from the edge on an intake side of the piston upper surface to the edge on an opposite exhaust side of the piston upper surface, the non-adiabatic region having no insulating layer;
- and
- an adiabatic region that is disposed on part of the piston upper surface that is positioned laterally relative to the non-adiabatic region, the adiabatic region having an insulating layer,
- wherein both an intake side end and an exhaust side end of the non-adiabatic region join together with a piston wall of the piston.
A piston for an internal combustion engine, comprising:
- a non-adiabatic region that includes a central portion of a piston upper surface, the non-adiabatic region being shaped like a strip extended from an intake side to an exhaust side of the piston upper surface, the non-adiabatic region having no insulating layer;
- an adiabatic region that is disposed on part of the piston upper surface that is positioned laterally relative to the non-adiabatic region, the adiabatic region having an insulating layer;
- and
- two pairs of an intake valve and an exhaust valve arranged in parallel;
- wherein a short side length of the non-adiabatic region is a distance between a line segment that connects centers of umbrella-shaped portions of the intake and exhaust valves of a first pair of the two pairs and a line segment that connects centers of umbrella-shaped portions of the intake and exhaust valves of a second pair of the two pairs.
Dependencies are inferred from the claim text.